Lindsey Groves, the museum's mollusc collection manager passed on the image to Angel Valdes, co-author with Terry Gosliner & Dave Behrens of "Indo-Pacific Nudibranchs & Sea Slugs". He confirmed that Linda's animal is what they called Haminoeid sp 2 in the book. One thing that keeps it out of the genus Haminoea is the extremely long tail which you can sorta see in Linda's pic & clearly in Indra's Nudipixel pic.